Shell Array related Operations

Reference: http://www.cnblogs.com/chengmo/archive/2010/09/30/1839632.html

Create an array

A= (12345)

Get array length

${#a [@]} #${#变量} to get variable length ${#a [*]}

Print array Contents

Echo ${a[@]}    #echo $a print only the first element of the array echo ${a[*]}

Delete

unset a[1]    #删除单个成员unset a        # delete entire array

Single Assignment

a[1]=a[]=#下标值超出长度索引, when the length of the array A is 5+1=6,a[5],a[6],a[7],a[8],a[9] no value, Print the last contents of the array: Echo ${A[10]}

Sharding

Echo ${a[@]:1:2}    #格式: ${variable name [@ or *]: Start index: Shard length}
C= (${a[*]:1:2})     #若不用括号扩起来得到的是字符串
C=${a[*]:1:2} #此时, C is a string

Replace

echo ${a[@]/2/$     #不会改变原数组ay=${a[*]/2/$}         # At this point, Y is the string y= (${a[@]/2/$})     #此时, y is an array

Shell Array related Operations